CAS v0.2.1

• Bump version to 0.2.1 for installation test release
• Add installation scripts and update release workflow for public repo
• Redesign statusline with verbose labels and multi-agent support
• Add configurable embedding models with multi-architecture support
• Add tests for consolidated MCP tools
• Consolidate MCP tools from 77 to 7 meta-tools (~85% token reduction)
• Add multi-agent coordination and iteration loop features